Harm of four pests:
1. flies: flies breed and fly among garbage, cesspits, toilets, decaying animal carcasses, pus, sputum and vomit, and feed on them. Its body surface and abdomen carry tens of thousands of bacteria, viruses and parasitic eggs.
Flies have the habit of eating, spitting and pulling. Wherever they fly, food will be contaminated by bacteria, viruses and eggs. When people eat contaminated food or use contaminated utensils, intestinal infectious diseases will occur and become parasitic diseases.
2. Mosquitoes: Mosquitoes have the habit of sucking blood. When sucking blood, they look for amino acids of human beings or animals, especially babies or people with delicate skin. When mosquitoes suck blood, they can inject plasmodium, filariasis and Japanese encephalitis with saliva to infect people. So mosquitoes not only bite and suck blood, but also spread Japanese encephalitis, malaria, dengue fever and filariasis.
3. Rats: The harm of rats is well known. It not only steals food, bites furniture, clothes, books and stationery, destroys buildings, bites off wires and so on. , causing economic losses, but also the most serious of the "four pests." Rats mainly spread plague, leptospirosis, Lambert's disease, epidemic hemorrhagic fever and endemic diseases by biting people, sucking blood or polluting excrement.
4. Cockroaches: Cockroaches often crawl around in toilets and trash cans, sucking dirt, and their bodies are covered with bacteria, viruses and parasite eggs. They also like to feed on human food and leftovers, polluting utensils and food, which can cause infectious diseases such as hepatitis A, dysentery, typhoid fever and cholera or bacterial food poisoning, as well as parasitic diseases such as roundworms and hookworms.
In recent years, it has also been found that cockroaches can make some people suffer from allergic diseases, such as allergic rhinitis and bronchial asthma.